This commit splits the lint and test steps into two different jobs in
github actions.
Consider this a suggestion, the idea is that when we look at PRs we will
see explicitly which one of the two types of checks fails without having
to open Github actions.
The issue was that our build pipeline uses 'go get' call to install
golint, which changed the go.mod/go.sum files (not good, but I hadn't
noticed before). Due to Golang bug #44129, this caused breakage on the
dependencies of certain modules we use.
The fix was to switch to 'go install golang.org/x/lint/golint@latest'.
The addition of '@latest' puts 'go install' in module aware mode, which
no longer changes go.mod file in the current directory. This is better,
and it also avoids bug #44129.
This commit also has a change due to `go mod tidy`. Finally, I had to
add a longer timeout for the golangci-lint installation step in the
github actions workflow, since that seems to take a bit over a minute
now. This step is usually cached on subsequent runs, so we hadn't seen
that failure before.
